I produced the livestock fan, also known as negative pressure fan, the following talk about the principle of choice of negative pressure fan.
1. Should understand the domestic production and product quality of negative pressure fan, such as the production of the fan varieties, specifications and a variety of products for special purposes, new product development and promotion, etc., should also take full account of environmental requirements, Selection.
2. According to the negative pressure fan transport gas physical and chemical properties of different, choose different uses of negative pressure fan. Such as the transport of explosives and flammable gases should be selected explosion-proof fan; dust or transport of coal should be selected dust or pulverized coal fan; corrosive gas should be transported to choose anti-corrosion negative pressure fan; Or the transmission of high temperature gas should choose high temperature negative pressure fan and so on.
3. In the negative pressure fan selection performance chart found on more than two kinds of negative pressure fan to choose from, should give priority to select the higher efficiency, smaller machine: a larger range of adjustment, of course, should be compared , Weigh the pros and cons and decide.
4. If the selected negative pressure fan impeller diameter is much larger than the original fan impeller diameter, in order to take advantage of the original motor shaft, bearings and bearings, etc., must be the motor start time, the original parts of the fan strength and shaft The critical speed and so on.
5. When selecting the negative pressure fan, when the motor power is less than or equal to 75KW, it can not be installed only for the start of the valve. When the high temperature flue gas or air and the choice of centrifugal boiler fan, the start should be used to prevent the cold valve caused by overload operation.
6. For ventilation systems with muffling requirements, first select the ventilator with high efficiency and impeller peripheral speed and make it work at the highest efficiency point. Also, according to the noise and vibration propagation mode of the ventilation system, Muffler and damping measures. Ventilator and motor vibration control measures, generally can be used to cushion the foundation, such as spring shock absorber or rubber shock absorber.